How can I find infomation about family in the first world war?

Basically my grandad's uncle was a soldier in ww1 and I want to find out some infomation about him. I went to Belgium on a history trip last weekend and that made me realise how interesting it would be to know more about him. So how can I do that? I have some basic info my grandad has but thats all he knows. Looking through websites, I have a bit more info about him and a picture of his grave but I want a bit more! My grandad doesn't know i'm researching his uncle and I want it to be a suprise so I can't really ask him anything (even if I did, he's told me everything he knows!). What websites can help me? I can invest much money into it at the moment so the cheaper it will be, the better! Thankyou xx

When there are no people left that were alive back then, the information available will be from military records and possibly articles that might have appeared in his hometown newspaper at the time of his death. If you can locate the names of people that served with him, there is a long-shot possibility that you might be able to share information with the ancestors of others in his military unit. Genealogical associations and websites may be a good resource also.

If you can find out when and where he served, any historical information on the war that explains his unit's participation might be a good addition to your project.